Ambient PM_2.5 exposures could increase risk of tuberculosis recurrence.

"Declarations Ethics approval and consent to participateNot applicable. Consent for publicationNot applicable. Availability of data and materialsThe datasets used and/or analysed during the current study are available from the corresponding author on reasonable request. In terms of number of TB cases by district, the data is publicly available in the following KCDA web site. (https://www.kdca.go.kr/npt/biz/npp/portal/nppPblctDtaMain.do?pblctDtaSeAt=1) Competing interestsThe authors declare no competing interests. FundingThis work was supported by a National Research Foundation of Korea grant funded by the Korean government (No. 2018K1A3A1A09079641). Authors’ contributionKDM - Conceptualization, Formal analysis, Writing - Original draft; SYK - Resources, Data curation, Methodology, Writing - Review & Editing; SIC - Conceptualization, Writing - Review & Editing, Supervision; All authors read and approved the final manuscript. AcknowledgementsNot applicable. Competing interests The authors declare no competing interests."

"Funding This work was supported by a National Research Foundation of Korea grant funded by the Korean government (No. 2018K1A3A1A09079641)."